Defiant Questline in Mathosia
Starting in the Tutorial zone of Terminus, then moving onto the Defiant controlled zones of Freemarch and Stonefield and onward to the rest of the world.
Mathosia will provide you with quests to level up to level 50.
Ember Isle is a level 50 zone, but it’s built to be challenging so you will likely find it easier to go straight to Storm Legion areas and come back to Ember Isle at a later date.
Planetouched Wilds is also in Mathosia, this is a level 65 zone so you will come back to quest there after completing Storm Legion and Nightmare Tide areas.